Making a quick list for this, since it'll speed up the process a bit.
- Widescreen resolution
- Multi-monitor
- Ultra-widescreen
- Field of view (FOV)
- Windowed
- Borderless fullscreen windowed
- Anisotropic filtering (AF)
- Anti-aliasing (AA)
- Vertical sync (Vsync)
- High frame rate
- Color blind mode
- Custom resolution
- Remapping
- Mouse acceleration
- Mouse
- Invert Y-axis
- Local play
- LAN play
- Online play
- Local co-op
- LAN co-op
- Online co-op
- Hot-seat
- Asynchronous multiplayer
- Matchmaking
- Peer-to-peer
- Dedicated
- Self-hosting
- Bottleneck
- Overclocking